cobblemon-survival-pack/tools/machine_assets.py

#!/usr/bin/env python3
"""Writes the machine cores' textures, block models, item models and blockstates (Phase 6).

Each core is an "orientable" block (front, side, top) facing the player who placed it. The 16x16 textures are drawn
here, from a palette and an emblem per machine, so they can be redrawn after a change. Our own art (pack license).
The cores are see-through (Adrian, 2026-11-02: the Pokémon in the chamber behind the core must be visible): a solid
frame around tinted glass, the emblem faint on the front; the models render translucent.

Usage: tools/machine_assets.py
"""
import json
from pathlib import Path

from PIL import Image

ROOT = Path(__file__).resolve().parent.parent
ASSETS = ROOT / "mod/src/main/resources/assets/cobblesurvival"

# name: (dark, mid, light, accent, emblem)
CORES = {
    "heat_core": ((92, 34, 26), (150, 62, 44), (186, 92, 66), (255, 160, 40), "flame"),
    "dynamo_core": ((112, 58, 36), (184, 104, 70), (224, 150, 108), (255, 230, 70), "bolt"),
    "synthesis_core": ((70, 74, 80), (128, 134, 142), (180, 186, 194), (90, 220, 120), "drop"),
    "altar_core": ((22, 18, 26), (52, 44, 58), (84, 72, 92), (190, 60, 220), "eye"),
    "rebirth_core": ((70, 40, 110), (130, 90, 190), (186, 150, 236), (255, 200, 245), "star"),
}

EMBLEMS = {
    "flame": [
        "......#.........",
        ".....##.........",
        ".....###..#.....",
        "....####.##.....",
        "...#########....",
        "...##########...",
        "..###++######...",
        "..##++++#####...",
        "..##+++++####...",
        "...##+++++##....",
        "....########....",
    ],
    "bolt": [
        "........####....",
        ".......####.....",
        "......####......",
        ".....####.......",
        "....#######.....",
        ".......####.....",
        "......####......",
        ".....###........",
        "....##..........",
        "...#............",
    ],
    "drop": [
        ".......#........",
        "......###.......",
        ".....#####......",
        "....###+###.....",
        "...###+++###....",
        "...##+++++##....",
        "...###+++###....",
        "....#######.....",
        ".....#####......",
    ],
    "eye": [
        "................",
        ".....######.....",
        "...##......##...",
        "..#...####...#..",
        ".#...##++##...#.",
        "..#...####...#..",
        "...##......##...",
        ".....######.....",
    ],
    "star": [
        ".......#........",
        ".......#........",
        "......###.......",
        "..###########...",
        "....#######.....",
        ".....#####......",
        "....###.###.....",
        "...##.....##....",
    ],
}


GLASS_ALPHA = 70
EMBLEM_ALPHA = 150


def frame(image, dark, mid, light):
    """A two-pixel frame: light top-left edge, dark bottom-right edge, mid inner ring."""
    for i in range(16):
        for a, b in ((i, 0), (0, i)):
            image.putpixel((a, b), light + (255,))
        for a, b in ((i, 15), (15, i)):
            image.putpixel((a, b), dark + (255,))
    for i in range(1, 15):
        for a, b in ((i, 1), (1, i), (i, 14), (14, i)):
            image.putpixel((a, b), mid + (255,))


def glass(dark, mid, light, accent):
    """Tinted glass inside the frame, with a few lighter streaks so the face still reads as a surface."""
    image = Image.new("RGBA", (16, 16), (0, 0, 0, 0))
    tint = tuple((m + a) // 2 for m, a in zip(mid, accent))
    for y in range(2, 14):
        for x in range(2, 14):
            streak = (x - y) in (3, 4) or (x - y) == -6
            image.putpixel((x, y), (light if streak else tint) + (GLASS_ALPHA + (50 if streak else 0),))
    frame(image, dark, mid, light)
    return image


def side(dark, mid, light, accent):
    return glass(dark, mid, light, accent)


def top(dark, mid, light, accent):
    image = glass(dark, mid, light, accent)
    for x, y in ((2, 2), (13, 2), (2, 13), (13, 13)):
        image.putpixel((x, y), accent + (255,))
    return image


def front(dark, mid, light, accent, emblem):
    image = glass(dark, mid, light, accent)
    rows = EMBLEMS[emblem]
    top_row = (16 - len(rows)) // 2
    glow = tuple(min(255, c + 60) for c in accent)
    for y, row in enumerate(rows):
        for x, c in enumerate(row):
            if 2 <= x <= 13 and 2 <= top_row + y <= 13 and c in "#+":
                image.putpixel((x, top_row + y), (accent if c == "#" else glow) + (EMBLEM_ALPHA,))
    return image


def write_json(path, data):
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(data, indent=2) + "\n")


def main():
    textures = ASSETS / "textures/block"
    textures.mkdir(parents=True, exist_ok=True)
    for name, (dark, mid, light, accent, emblem) in CORES.items():
        side(dark, mid, light, accent).save(textures / f"{name}_side.png")
        top(dark, mid, light, accent).save(textures / f"{name}_top.png")
        front(dark, mid, light, accent, emblem).save(textures / f"{name}_front.png")
        write_json(ASSETS / f"models/block/{name}.json", {
            "parent": "minecraft:block/orientable",
            "render_type": "minecraft:translucent",
            "textures": {"top": f"cobblesurvival:block/{name}_top", "front": f"cobblesurvival:block/{name}_front",
                         "side": f"cobblesurvival:block/{name}_side"},
        })
        write_json(ASSETS / f"models/item/{name}.json", {"parent": f"cobblesurvival:block/{name}"})
        rotation = {"north": 0, "east": 90, "south": 180, "west": 270}
        write_json(ASSETS / f"blockstates/{name}.json", {
            "variants": {f"facing={facing}": {"model": f"cobblesurvival:block/{name}", **({"y": y} if y else {})}
                         for facing, y in rotation.items()},
        })
    print(f"wrote {len(CORES)} cores to {ASSETS.relative_to(ROOT)}")


if __name__ == "__main__":
    main()